Road-grader.



e. M. HUEBSCH. ROAD.GRADERi APPLICATION FILED IAN.4, I916.

Pamnted Sept. 5, 1916 INVBNTOR I Geo ATTORNEY 55 of the pulley E.

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GEORGE M. I-IUEBSCH, OF POMONA, CALIFORNIA.

ROAD-GRADER.

Specification of Letters Patent.

Patented Sept. 5, 1916.

To all whom it may concern:

Be it known that I, Gnonen M. HUEBSCH, a citizen of the United States, residing at Pomona, in the county of Los Angeles and State of California, have invented certain new and useful Improvements in Road- Graders, of which the following is a specifi cation. My invention relates to road graders, and

the objects contemplated are the provision of a machine of this character which will eliminate the rough or bumpy condition of a road; and the provision of a machine which is simple in construction, arrangement and operation.

To the accomplishment of the recited ob jects, and others coordinate therewith, the preferred embodiment of my invention resides in that arrangement of parts shown in the accompanying drawings, hereinafter de- Fig. 2 is an end elevation of the device, and

Fig. 3 is a fragmentary detailed view of one of the scarifying teeth.

Generally speaking, my invention comprises a rotatable hollow drum adapted to be connected to a suitable source of power,

and provided with a plurality of teeth which are pivotally mounted on the inner side of the drum and extend therethrough in series, the teeth of each series being disposed in echelon circumferentially with respect to the said drum so that when the latter is rotated all bumps which are in the path of the drum will be planed down even with the smooth surface of the road. The drum is rotated at a high rate of speed and the teeth conse quently maintained in an extended position by centrifugal force, the idea in this arrangement being that while the teeth are positive in their cutting action under normal conditions, they are permitted to recede when encountering rocks or other similar obstructions which may be present in the road bed.

Referring more particularly to the drawings for a detailed. description of my invention, the letter A designates a drum closed at both ends and provided with a centrally arranged shaft E which is connected with any suitable source of power by means Extending through the Walls of the drum are a plurality of slots 13 for receiving the teeth B, which are formed integrally with an arm B, the latter being pivoted at D to the lugs C projecting inwardly from the interior of the drum. The slots B and their complemental teeth B are arranged in series, .and in each series these parts are disposed in echelon circumferentially of the drum, with the result that there will be a gradual cutting action during the entire path of the drum and only a minimum number of teeth will engage the road simultaneously. Upon reference to Fig. 3, it will be noted that the outer free extremity of the arm B extends beyond the tooth B and the walls of the slot B, this construction serving to reinforce the tooth and to impose a preponderance of weight so that the tooth will not recede within the drum too readily. As the drum is rotated rapidly, the teeth B will be projected outwardly to their fullest extent, and plane down the rough surfaces of the road to a nicety. The outward move ment of the teeth is manifestly limited by virtue of the engagement of the arms B with the inner wall of the drum, but they may yield inwardly or swing on the pivot D.

The fact that only a few of the teeth engage the road at the same time relieves the machine of any undue strain, which would obviously result if the teeth were disposed in continuous alinement transversely of the drum. It will also be seen that upon striking an obstruction which offers greater resistance than the normal consistency of the road, the teeth will recede wholly within the drum and thus be protected from further engagement with the abnormal obstruction; A

still further advantage resides in the fact that the base of the teeth are rigidly braced upon all sides against lateral thrust by the walls of the slots.

What is claimed, is:

1. In a road grader, the combination of a circumferentially slotted drum designed for rotation at a high velocity, a plurality of lugs arranged interiorly of said drum, and teeth pivoted to said lugs and extending outwardly through said slots, said teeth being maintained in extended position by centrifugal force, and adapted to yield and recede wholly within said drum upon striking an abnormal obstruction.

2. In a road grader, the combination of a circumferentially slotted drum designed for rotation at a high velocity, a plurality of lugs arranged interiorly of sand drum, arms pivoted to said lugs and conforming to the contour of the drum, and a tooth carried by each arm and extending outwardly through its adjacent slot, each arm having a portion extending beyond the tooth and outwardly beyond the slot, said teeth being maintained in extended position by centrifugal force.

3. In a road grader, the combination of a circumferentially slotted drum designed for rotation. at a high velocity, a plurality of lugs arranged interiorly of said drum, arms pivoted to said lugs and conforming to the contour of the drum, and a tooth carried by each arm and adapted to extend outwardly through, and fit snugly with respect to the walls of its adjacent slot, said teeth being maintained in extended position by centrifugal force, and adapted to yield and recede wholly within said drum upon striking an abnormal obstruction.

In testimony whereof I hereunto aflix my signature in the presence of two witnesses. GEORGE M. HUEBSC-H. Witnesses J. SPERL, T. E. GUERIN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

